Thanks OP, I've been thinking about making something, CBA faffing around creaming, baking etc, but tiffin I can do.
And as long as you get the chocolate/syrup/biscuits and other bits ratio right, so it holds together properly, you can put whatever you want in it, so good for using up odds and sods of dried fruit, nuts, cheap boring biscuits that no-one really likes etc.
Or you can go a bit fancy and make it with nicer biscuits, bits of fudge, glace cherries, or whatever you like. Whichever way, the cheap 30 p bars of value chocolate sold in most supermarkets are great for this sort of thing.